Adjusting knob for framing devices



May 12, 1931. K. HOFFMANN 1,804,501

ADJUSTING KNOB FOR FRAMING DEVICES Filed Jan. 25, 1927 nis Fig. 6 44 llll llllllll "Mullin /10 As A?.

nventor; Byzzri Erg/@mw Wm KM.

Attorney.

Patented May 12, 1931 UNTED STATES PATENT OFFICE KURT HOFFMANN, I DRESDEN, GERMANY ADJUSTING KNOB IOR FRAMING DE'ICES i Application led January 25, 1927, Serial No. 163,471, and in Germany and France Inch 28, 1926.

i The present invention relates to cinematographic projecting apparatusesand more partlcularly to an adjusting mechanism for ythe framing device thereof. In many of the now prevalent types of framing devices a driven shaft is provided whereby motion may be transmitted to the film gate or s rocket/wheel of the projector in order to a just the film with respect to'the icture 1c window of the film gate for causing t e picture to be properly framed upon the screen. The primary object of the invention is to provide a compact adjusting mechanism capable of being arranged in a suitable .knob or lo handle and the latter bein applicable to the drive shafts-of several o the now prevailing types of framing devices used in connection with moving plcture machines.

Another equally important object of the invention is to provide van adjusting knob or drive device of the character aforesaid whereby the framing mechanism will be automati cally retained or locked against accidental movement when the adjusting device is at rest and one in which the framing mechanism will be automatically released upon operation of the adjusting device.

Other objects of the invention will be in part obvious and in part pointed out hereinafter.

in order that the invention and its mode of operation may be readily understood by those skilled in the art to which it appertains, l have in the accompanying illustrative drawings and in the detailed following de scription based thereupon, set out one possible embodiment of my invention,

in these drawings:

.Figure i is a side elevation of the knob or handle embodying the invention and applied to an ordinary moving picture machine,

Figure 2 is a transverse section through the same when the knob is in a vertical position.

Figure 3 is a horizontal section taken on the line fC-D oi Figure 2 in the direction oiJ the arrows as shown,

f re i is a similar view taken on the line gil-F ci Fig. 2,

Figure 5 is a detailed to the driving gears9 plan view of one of litigare 6 is a side elevation of the same, an

Figure 7 is a side elevation of the clutch carrying disc.

Referring now more particularly to the accompanying drawings wherein like and cor responding parts are designated by similar reference characters throughout, I have illustrated a portion of an ture machine casin C having arranged therein any desired orm of framing device which latter is provided with a drive shaft 2 projecting from one side of the casin C. By rotating this drive shaft in either irection motion will be transmitted to the main gear ing G- of the framing device for actuating the latter and in order that this shaft 2 may be manually adjusted I provide a handle or knob therefor.

Secured to the projector casing C in any suitable manner or by the set screws, as shown, is a bearing bracket 1 through which extends the shaft 2o The outer end oi this bracket is reduced and fixed theretoby the set screw 2i is the sleeve portion of a stationary casing or section 9 of the knob or handle. Rotatably connected by means of the set screw 20 to the outer extremity of the shaft 2 is the outer hollow casing or section 17 of the knob. The outer end 3 of the shaft 2 is of a squared cross section and is receivable within a sleeve or bearing 4b of a clutch disc Ll. This disc 4 is seated within the fixed casing 9 but is free to rotate therein with the shaft 2, and to limit the rotation of the disc 4 with respect to the casing 9, l provide a clutch therebetween. rihis clutch consists of two balls or rollers 6a and 6b each arranged within a recess 5a or 5b :formed within the outer periphery of the disc d. lllhese recesses are each so formed that the base portion thereof is of greater width than the diameter of the roller seated therein, but the outer or opposite end 8a or 8b of each recess is of less width than the diameter of the roller therein. Expansible coiled springs 7o and 7b are carried by the disc and one rejects within each recess in order to normal y torce the roller within that recess towards the outer or narrow end thereof whereat the rollers will eilect a wedging action between the disc and ordinary moving picinner wall of the fixed casing 9 whereby the disc will be locked to the casing 9 and the shaft 2 retained against rotation.

. lA planetary gearing is herein shown for establishing a drive connection between the casing 17 and the shaft 2 or disc 4 keyed thereto. This gearing consists of a double pinion 16 rotatably supported by a shaft 18 within the casing 17 and this pinion has two sets of gear teeth 16a and 16?). Freely mounted upon the bearin sleeve 4b is a gear wheel 10 the teeth of whic mesh with the gear teeth 16'b of the pinion, whereas a stationary gear 14 surrounds the sleeve 4b and meshes with the teeth 16a of the pinion.. This gear wheel 14 is retained stationary by connecting the same to the xed casing 9 by means of the bracket 15 in the manner as shown in Figures 2 and 3. De yending fromand secured to the lower face o4 the gear wheel 10 are three pins one of which indicated by the numeral 11 is seated within an enlarged recess or opening 12 vformed within the disc 4 whereas the other pins 13a and 13b project within a recess 5a or 5b. From this construction it is obvious that when the gear 10 starts to rotate in either direction the in 11 will be free for a slight movement wit in the enlarged opening 12 of the disc 4 or until one of the pins 13a or 13b releases the roller wedged between the disc and stationary casing 9. After such roller has been released the pin 11 will contact with the disc 4 and cause the same to rotate with the gear 10. During` rotation of the gear 10 in a same time the rotation of the disc 4 will cause the roller 6b to roll within the enlarged end of the recess 5b, against the action of the spring 7 b'. When the gear 10 comes to a complete stop pressure upon the coiled springs 7a and 7 b is released and the rollers are again forced into a wedging contact between the disc 4 and casing 9 whereby the disc and shaft 2 connected thereto will be retained against rotation until power is again supplied to the gear 10.

Modus operamZz-This adjusting knob or handle may be applied to any of the now prevailing types of' moving picture machines having a support or casing C and a projecting drive shaft 2 of the framing mechanism therefore by first securing to the casing C the bearing bracket 1 and then attaching to this bearing bracket 1 the fixed casing 9 of the knob. The clutch disc 4 is then placed over the square end of the shaft 2 so that the clutch members will be seated within the casing 9. The rotatable casing 17 having the transmislsion gearing therein is placed in position labout the bearing sleeve of the disc 4 and the casing 9 is secured to the shaft 2 by the set screw 19. The operator by turning the casing 17 will transmit motion to the shaft 2 through gearing as has been previously described Whereby the shaft 2 maybe rotated in either direction and in so rotating the shaft projector ofttimes causes the picture to be projected out of frame, but owing to'y the clutch connection between the shaft 2 and the fixed casing 9 the framing devices will be locked agamst such accidental movement.

From a consideration of Figure 4 it will be noted that when the disc 4 is at rest vor no movementvv transmitted thereto through the knob 17 should the shaft 2 attempt to rotatev in either direction, one of the rollers a'or 6b will be moved within the narrow portion of its recess where it will be wedged between the disc 4 and the casing 9 for holding the shaft 2 against such rotatlon and likewise the framing mechanism retained in its adjusted position. By turning the knob 17 motion will be transmitted to the gear 10 whereby the pins v13a and 13b will release the rollers from theirv wedged position and permit the disc 4 to travel with the gear 10 by Contact of the pin 11 with the disc so that the shaft 2 will be caused to rotate upon movement of the knob 17.1 During the rotation of the disk 4 by the knob 17 one ofthe pins 13a or 13b will act to retain its respective roller within the larger end of its recess, while the remaining roller will be simultaneously pushed into the larger portion of its respective recess by the component of force from the relative rotationof the disk with respect to the stationary section 9. Consequently, it will be understood that as long as the disk is being so rotated, the clutch will be disengaged but when the knob is .at rest, the clutch will be automaticallyengaged. 4

I claim: 1. The combination with ary member and the shaft and means operable by said rotatable member for releasingsaid l a moving picture v machine having a rotatable shaft of the framclutch during the rot-ation of the shaft by rotatable member.

3. An adjusting mechanism for rotatable shafts com rising a stationaryfcasing, a rotatable caslng, a transmission gearing arranged within said rotatable casing, a disc carried by the shaft, a clutch arranged between said dise and stationa casing for normally holding said disc against rotation, means for operatively connecting said gearing t'o said disc and means whereb said gearing is rotated said clutch will released and the shaft caused to revolvewith said n gearing. l5

4r An adjusting mechanism for rotatable ,shafts comprising a fixed casing, a rotatable casing, planetary gearing arranged within' and operable by said rotatable casing-a disc connected totheshaft, a clutch arranged between said disc and stationary casing for retaining the shaft against rotation, means operable by said gearing for releasin said clutch and means for connecting sai disc to said gearing when said clutch is released whereby said shaft may revolve with said gearing. V A

5. A knob for adjustingrotatable shafts Aof the framing mechanism of motion pic-l sa annulerings, guiada 1m..-

said flan e, a handle rotata ly secured to said sha t and means for voperatively oon-` nectin said handle to said r wheel where by wi rotation of said andle said shaft will be caused to rotate therewith. i

In testimony whereof I aix m signture. l KURT HOF MASNN.

ture machines, comprising 'a fixed casing, a

rotatable casing, -means for operatively connecting said rotatable casing '.-to the shaft, means arranged within said stationary cas, ing for retaining the shaft against rotation, and means' operable by said rotatable casing for releasing said retaining means. l 6., An adjusting means for rotatable shafts comprising a stationary casing, a disc connecte'd to said shaft and arranged within said casing, a gear wheel rotatable aboutsaid shaft and operatively connected to said disc, aknob rotatably secured tothe shaft,'a sta- A tionary gear connected to said casing and` a pinion carried by said knob and meshing with said gears whereb said knob the shaft will therewitho upon rotation o caused to revolve 7. The combination with a bearing bracket ada ted to be secured toa moving picture mac ine housing and a picture framing shaft extending therethrough and projecting therefrom, a casing lixedly secure to said bracket, a disc secured to said shaft and -arranged within said casing, a knob rotatably mount-v ed upon the outer end of said shaft, a transmission gearing connecting said knob with.

said disc, clutch members arranged between frictionalt said casing and disc for locking the ,latter against vrotation in either .direction and means controlled b clutch mein rs when said knob is rotated.

8. An adjustin means comprising in combination, a rotata le shaft, a bearing bracket therefor, a fixed casing secured to said bracket, an annular ange formed with said 'casing, adisc carried by said shaft and arranged said gearing for releasingsaid. 

